[Al Skierkiewicz]

General,
(what is your name really?) The Victor handles a conversion internally, taking the RC PWM signal and decoding direction and magnitude and then further conditioning to make a PWM output at 150Hz. To add more to the equation, IFI has added to the conversion a scaling function such that the 127 step encoded RC PWM (255 less the dead band and less the direction) and makes 93 steps of output PWM in each direction. There is some info on the IFI site if you look for it. Check the documents and forum questions.
So I know your next question, 'why so many different signals?'. Well this is a complex answer. A lot has to do with price and available technology when the system was first developed, and backward compatability. Pre 2000, FIRST robots were still using hobby motor controllers (Tekins, sp?). So the logical next step was to develop a controller that would talk to those devices. They were underdesigned for the motors and stress we need from a robot controller so IFI developed the Victor 883. Those controllers output a PWM signal at 2kHz as I remember. The high switching frequency was fine for most operation but just didn't give optimal low speed control for the motors that are supplied in our KOP. The output also caused problems at near full speed conditions as well. So the 884 was developed which lowered the output switching frequency and made other improvements. Thanks to IFI for their dedication to responding to a very limited market.
As I pointed out earlier, there is a product on the website you and I both have quoted that will make the conversion. It is $66 but that sounds cheap for what it does.